tree:   https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.tty-ioctl
head:   5813bfc971394b8bab482bbb4f26a68d34c6cfb3
commit: 6c8b7b17bd0d9cc3e5d5b1f644fa98227b32e0ab [49/50] pty: fix compat ioctls
config: openrisc-or1ksim_defconfig (attached as .config)
compiler: or1k-linux-gcc (GCC) 6.0.0 20160327 (experimental)
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 6c8b7b17bd0d9cc3e5d5b1f644fa98227b32e0ab
        # save the attached .config to linux build tree
        make.cross ARCH=openrisc 

All errors (new ones prefixed by >>):

   drivers/tty/pty.c: In function 'pty_unix98_compat_ioctl':
>> drivers/tty/pty.c:688:41: error: implicit declaration of function 'compat_ptr' [-Werror=implicit-function-declaration]
      cmd == TIOCSIG ? arg : (unsigned long)compat_ptr(arg));
                                            ^~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/compat_ptr +688 drivers/tty/pty.c

   679	
   680	static long pty_unix98_compat_ioctl(struct tty_struct *tty,
   681					 unsigned int cmd, unsigned long arg)
   682	{
   683		/*
   684		 * PTY ioctls don't require any special translation between 32-bit and
   685		 * 64-bit userspace, they are already compatible.
   686		 */
   687		return pty_unix98_ioctl(tty, cmd,
 > 688			cmd == TIOCSIG ? arg : (unsigned long)compat_ptr(arg));
   689	}
   690	

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